In this context seems to care for and to take care of smb are similar verbs. But if you mean cared-for as an adjective it means person having needed care
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January 17, 2016
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What time is it = который час ? (polite) сколько времени? (more useful)
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January 17, 2016
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в котором часу? referring only for hours, not specific time
во сколько? this question requires specific answer: what hour and what minute you mean
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January 17, 2016
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I'd put it in this way: Environmental problems are increasing and as time goes by we have more problems with pollution.
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January 17, 2016
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I've heard about Mary before
I have known this writer since 1970s (знание это состояние, а не процесс, на мой взгляд употребление континиус не имеет оснований)
I have known this song for a long time
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January 17, 2016
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The wrong word is 'some' because it is out of the sentence meaning
